If the half-time of krypton-81 is 229,00 years, how much krypton-81 was present when the ice first formed

What is the h + if the ph of a solution is 4.85

What is the enthalpy of 2NO2 (g) yields N2 (g) + 2O2 (g)

Oxygen and hydrogen are most likely to form what type of bond?

Which particle of an atom has the least mass? A. proton B. nucleus C. neutron D. electron

What are two methods humans have used to keep deadly diseases from spreading?

The greenhouse effect is a result of the Sun's energy being absorbed by objects on the Earth and converted into which type of radiation? A) Radio B) Visible C) Infrared D) Ultraviolet

Which was the limiting reactant: the zinc or the hydrochloric acid? Remember that the limiting reactant is completely consumed in a reaction and no new product is formed unless more of the limiting reactant is added.

How many moles are in 4,55 X 10^23 molecules of CO2 (rounded)

In standardization of NaOH solution, a student found that 25.55cm3 of base neutralized exactly 21.35cm3 of 0.12M HCl. Find the molarity of the NaOH.

Which is a base unit in SI? A. centimeter B. kilogram C. gram D. grams/milliliter